Linear Electro-Optic Effects in Tetragonal Phosphates and Arsenates

R. S. Adhav

doi:10.1364/JOSA.59.000414

Journal of the Optical Society of America
Vol. 59,
Issue 4,
pp. 414-418
(1969)
•https://doi.org/10.1364/JOSA.59.000414

Linear Electro-Optic Effects in Tetragonal Phosphates and Arsenates

R. S. Adhav

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R. S. Adhav, "Linear Electro-Optic Effects in Tetragonal Phosphates and Arsenates," J. Opt. Soc. Am. 59, 414-418 (1969)

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Abstract

The electro-optic parameters of point group $\bar{4}$ 2m phosphate and arsenate crystals have been measured in the wavelength range 400 to 700 nm at room temperature. The values for the half-wave voltage V_λ/2 and the electro-optic constant r₆₃ at 550 nm are:

Material		V_λ/2 kV	r₆₃ cm/V
ADP	NH₄H₂PO₄	9.20	8.4 × 10⁻¹⁰
D–ADP	ND₄D₂PO₄	6.55	11.9 × 10⁻¹⁰
KDP	KH₂PO₄	7.45	10.6 × 10⁻¹⁰
D–KDP	KD₂PO₄	3.85	20.8 × 10⁻¹⁰
RbDP	RbH₂PO₄	5.15	15.5 × 10⁻¹⁰
ADA	NH₄H₂PO₄	7.20	9.2 × 10⁻¹⁰
KDA	KH₂AsO₄	6.50	10.9 × 10⁻¹⁰
D–KDA	KD₂AsO₄	3.95	18.2 × 10⁻¹⁰
RbDA	RbH₂AsO₄	4.85	14.8 × 10⁻¹⁰
D–RbDA	RbD₂AsO₄	3.40	21.4 × 10⁻¹⁰
CsDA	CsH₂AsO₄	3.80	18.6 × 10⁻¹⁰
D–CsDA	CsD₂AsO₄	1.95	36.6 × 10⁻¹⁰

The material D–CsDA requires V_λ/2 = 1.95 kV; and this is the smallest so far measured for the longitudinal linear electro-optic effect. Single crystals of D–CsDA have the advantage over others in modulator applications where lower V_λ/2 is a major criterion.

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Anion	Cation complex	Compound	Transition Temp. K	V_λ/2 kV
	PO₄^{– – –}	KDP	123	7.45
K⁺	1.54 Å
1.33 Å	AsO₄^{– – –}	KDA	92	6.50
	1.79 Å
Rb⁺	PO₄^{– – –}	RbDP	146	5.15
1.47 Å	AsO₄^{– – –}	RbDA	111	4.85
Cs⁺	PO₄^{– – –}	CsDP	159	not $\bar{4}$ 2 m type
1.67 Å	AsO₄^{– – –}	CsDA	143	3.80

Anion	Cation complex	Compound	Transition Temp. K	V_λ/2 kV
	PO₄^{– – –}	KDP	123	7.45
K⁺	1.54 Å
1.33 Å	AsO₄^{– – –}	KDA	92	6.50
	1.79 Å
Rb⁺	PO₄^{– – –}	RbDP	146	5.15
1.47 Å	AsO₄^{– – –}	RbDA	111	4.85
Cs⁺	PO₄^{– – –}	CsDP	159	not $\bar{4}$ 2 m type
1.67 Å	AsO₄^{– – –}	CsDA	143	3.80

Material	Formula	n₀ at 550 nm	V_λ/2 kV	r₆₃ × 10⁻¹⁰ cm/V
ADP	NH₄H₂PO₄	1.526	9.20	8.4
D–ADP	ND₄D₂PO₄	1.521	6.55	11.9
KDP	KH₂PO₄	1.512	7.45	10.6
D–KDP	KD₂PO₄	1.508	3.85	20.8
RbDP	RbH₂PO₄	1.510	5.15	15.5
ADA	NH₄H₂AsO₄	1.580	7.20	9.2
KDA	KH₂AsO₄	1.569	6.50	10.9
D–KDA	KD₂AsO₄	1.564	3.95	18.2
RbDA	RbH₂AsO₄	1.562	4.85	14.8
D–RbDA	RbD₂AsO₄	1.557	3.40	21.4
CsDA	CsH₂AsO₄	1.572	3.80	18.6
D–CsDA	CsD₂AsO₄	1.567	1.95	36.6

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